Resumen de Las traquitas de Arenys d'Empordà (Alt Empordà, NE de la Península Ibérica): características generales
N. Díaz, Domingo Gimeno Torrente, M. Losantos, C. Segura
A new outcrop of neogene trachytic rocks has been found at Arenys d´Empordà (Alt Empordà, NE, Spain). These trachytes and the associated alkali basalts must be related to the Vilopriu set of faults. The trachytes are mainly holocrystalline, glomeroporphyritic and microlitic in texture. Whole rock geochemistry shows that these rocks are potassic trachytes and quite homogeneus in composition. Available data on mineral chemistry (phenocrysts: andesine-oligoclase Plg mantled by K-anortoclase or Na-Sanidine, flogopite, oxidized kaersutite, apatite; microliths of andesine and Na-sanidine) and modal distribution allows a fair distinction when compared with the Vilacolum trachytes.
